Tube Furnace Toxicity

NFX 70-100, IEC 60754-1/2

The Tube Furnace Toxicity test method is used in the assessment of toxic or corrosive products during decomposition or combustion.

The apparatus is a small scale static tube furnace in which the test specimen (typically 1 gram or 0.1g for low density materials), is pushed, in a crucible, into the middle of the furnace tube and thermally decomposed.  Furnace temperatures of 400, 600 and 800°C tare used to represent oxidative pyrolysis, well-ventilated and under-ventilated conditions in flowing air at 2 litres min-1, where they may pyrolyse and auto-ignite.  For most materials at a temperature of 400°C they will not ignite, so the condition is oxidative pyrolysis.  At a temperature of 600°C, the rate of pyrolysis may be fairly slow, giving a well-ventilated fire condition, whereas at 800°C the fire condition may be closer to under-ventilated as the rate of pyrolysis exceeds the stoichiometric air supply rate. The effluent is driven through gas detection bubblers and gas bags for subsequent analysis.

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    Specification & Features

    System comprises of:

    • Horizontal tube furnace with the following dimensions: bore diameter 60mm; overall length 650mm; heated length 600mm; with operating temperature up to 1100°C, complete with temperature controller and display.
    • Special quartz work tube of overall length 1000mm complete with high temperature end collars
    • 10 porcelain combustion boats of appropriate dimensions to meet standard
    • 3/4 borosilicate glass wash bottles and, complete with 3/4 Drechsel wash bottle heads depending on test standard used
    • Associated tubing and fittings
    • Loading tool for inserting combustion boat into furnace
    • Suction pump
    • Calibrated flow meter
    • Optional Magnetic stirrer

    Options and Accessories:

    • Thermocouple system to allow furnace temperature profile measurement with handheld temperature indicator
    • Data Acquisition System to semi automate and record temperature profile, as well as auto start test, record test events with a remote handset.  Also records temperature profile during the test. The system can be configured to record the analogue signal voltage output of additional analysers (not supplied) for continuous measurements.  Raw test/temperature profile data is available for import into MS excel.  Windows 10 PC included
    • Porcelain combustion boats (pack of 10)
    • Borosilicate glass wash bottle
    • Drechsel wash bottle head
    • Spare tubing for above

    Experts since 1998

    We have been involved in the design and manufacture of fire testing, thermal analysis, rheology and spectroscopy instruments since the mid-eighties.

    Concept Equipment design and manufacture fire testing instruments according to international test methods.

    Location —

    Units 57-59 The Vinery, Arundel Road, Poling, West Sussex, BN18 9PY, UK